JJG 620-2008
Verification Regulation of Critical Flow Venturi Nozzle (English Version)

Standard No.

JJG 620-2008

Language

Chinese, Available in English version

Release Date

2008

Published By

National Metrological Verification Regulations of the People's Republic of China

Latest

JJG 620-2008

Replace

JJG 620-1994

Scope

This procedure is applicable to the initial verification, subsequent verification and in-service inspection of critical flow venturi nozzles for measuring gas flow and critical flow nozzles with no diffusion section at the outlet.

JJG 620-2008 Referenced Document

• JJF 1001-1998 General Terms in Metrology and Their Definitions
• JJF 1004-2004 Metrological Terms and Their Definitions for Flow Rate
• JJF 1059-1999 Evaluation and Expression of Uncertainty in Measurement

JJG 620-2008 history

• 2008 JJG 620-2008 Verification Regulation of Critical Flow Venturi Nozzle
• 1994 JJG 620-1994 Verification Regulation of Critical Flowmeter